Research And Implementation Of Vehicle Terminal Control System

In recent years, mobile internet has experienced a rapid development stage, greatly contributed to the popularity of mobile intelligent terminals, while increasing their degree of intelligence. In addition, with the advancement of science and technology and with people’s living standards improving, for the car intelligent, security, entertainment, comfort, etc, people put forward higher demands, and vehicle intelligent terminal system arises at the historic moment. The introduction of mobile smart devices to the vehicle intelligent terminal system is the current and future development trend.On the basis of a full analysis of research status at home and abroad on the vehicle terminal system, this paper presents a new type of vehicle intelligent terminal control system, which adopts distributed control structure, uses mobile smart devices as its control side. This paper designed and realized mobile intelligent terminal application (hereinafter generally referred to as software) and the server program.Based on Node.js platform and MySQL database, this paper uses JavaScript language to write the server-side program. On the one hand, it receives positioning data uploaded by vehicle terminal and saves the data to the database; On the other hand, it monitors the query of vehicle position information request sent by system software, and returns the corresponding vehicle location data to the client.The car device control function is through the system software establish a socket connection with PLC, and then system software send control instructions to PLC to control its corresponding relay’s state. Entertainment control function is based on the system software to establish a socket connection with the infrared module, and then infrared module send instructions to system software to control the emission of infrared light. Real-time vehicle tracking and historical vehicle trajectory queries send network request to remote servers to obtain the vehicle’s current position and all positions within the specified period, eventually marked out on the map.Innovation of this paper lies in that the system supports multiple mobile intelligent terminal to access and realize the synchronous control of the car. This paper presents a synchronization scheme based on relay status query and solves the synchronization problem between mutiple control terminals, and it means that system software sends status query commands to hardware device, and then get the state of the interface button.Finally, all the function of the system are tested, and the system time delay and server performance are tested through the preparation of test procedure. The test results show that the system functions normally, and has the good performance, but there is still room for improvement in terms of time delay.